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2004 Z71 Service 4WD

phwe9774

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phwe9774 Enthusiast

phwe9774

Posted
Posted

I have a 2004 Silverado showing Service 4WD when I start the truck. There aren't any lights lit on the switch. It randomly decided to work for me a couple months ago. I got to use it once, then it stopped working.

 

I checked the transfer case fluid and didn't see anything in it. I've replaced the switch, the TCCM under the dash and checked all the fuses that might have anything to do with 4WD. My usual Chevy guy has never heard of this problem before and has suggested either the actuator or a solenoid by the front axle. I figured I might as well ask here and try to use the abundance of GM knowledge before I continue swapping parts and hoping for the best.

durandetto Enthusiast

durandetto

Posted
Posted

Scan it for codes so you're not throwing parts at it. Could be a broken wire, a corroded pin in one of the connectors, the encoder motor or the axle actuator.

 

Sent from my LGLS990 using Tapatalk

phwe9774 Enthusiast

phwe9774

Posted
  • Author
Posted

I'm assuming you mean get it scanned with something other than an OBD-2. I've checked with an OBD-2 and it didn't show anything. Other than that, I don't know what else to have scanned.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

I'm assuming you mean get it scanned with something other than an OBD-2. I've checked with an OBD-2 and it didn't show anything. Other than that, I don't know what else to have scanned.

Scan the TCCM With a real scanner

phwe9774 Enthusiast

phwe9774

Posted
  • Author
Posted

What do you mean by "real scanner"? Is this mythical scanner something I can go to a parts store and buy, do I have to order it or do I have to take my truck to a shop or dealer?

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

What do you mean by "real scanner"? Is this mythical scanner something I can go to a parts store and buy, do I have to order it or do I have to take my truck to a shop or dealer?

Any decent garage has one , no ya can't go and buy 1 at a parts store

 

They cost more than $50 ,,, waaaay more

durandetto Enthusiast

durandetto

Posted
Posted

Yeah, you'll need more than a code reader to scan the tcase. If you're lucky and tell them you just want the codes they might not charge you.

 

Sent from my LGLS990 using Tapatalk

Knotsure Enthusiast

Knotsure

Posted
Posted

I had the same problem (or similar problem) on my 06 Sierra. I searched and searched for people who had the same problem and after changing the 4x4 switch I decided I was going to change the encoder motor sensor in the encoder motor assembly. I will try to find the link for the forum I found with step by step directions. I do all of my own work on my vehicles but am by no means a mechanic, and it took me less than an hour for the job once I got underneath my truck. The part cost me around $40. That is all I spent for this fix.

Knotsure Enthusiast

Knotsure

Posted
Posted

http://www.fullsizechevy.com/forum/general-discussion/technical-maintenance/417858-encoder-motor-sensor-replacement-w-pics.html

 

I am not sure if it shared a link but if not just copy and paste the above address and there are good directions on how to replace the encoder motor sensor. I changed my encoder motor sensor and have had ZERO 4x4 problems since. And , honestly, after reading the steps in the above link I was feeling a little overwhelmed . But it really was an easy fix. I almost had the encoder motor assembly back in , after replacing the sensor, without dropping the front driveshaft. I ultimately decided it was easier to finish the job after dropping the front drive shaft. I didnt install a new gasket in the Encoder motor assembly. It was In great condition still after 130000 plus miles. Good luck.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

http://www.fullsizechevy.com/forum/general-discussion/technical-maintenance/417858-encoder-motor-sensor-replacement-w-pics.html

I am not sure if it shared a link but if not just copy and paste the above address and there are good directions on how to replace the encoder motor sensor. I changed my encoder motor sensor and have had ZERO 4x4 problems since. And , honestly, after reading the steps in the above link I was feeling a little overwhelmed . But it really was an easy fix. I almost had the encoder motor assembly back in , after replacing the sensor, without dropping the front driveshaft. I ultimately decided it was easier to finish the job after dropping the front drive shaft. I didnt install a new gasket in the Encoder motor assembly. It was In great condition still after 130000 plus miles. Good luck.

Are you telling him to do the same thing as you ?

 

Can you IM him to give your mailing addy so he can get his money back if he actually does it and it still doesn't work ??????

 

Will you do that ?

 

Stop giving people advise on what to do " the same thing happened to me " is BS

 

You're not helping

Knotsure Enthusiast

Knotsure

Posted
Posted

Are you telling him to do the same thing as you ?

 

Can you IM him to give your mailing addy so he can get his money back if he actually does it and it still doesn't work ??????

 

Will you do that ?

 

Stop giving people advise on what to do " the same thing happened to me " is BS

 

You're not helping

Your post does not help the OP. I am however giving my experience and he can decide for himself what he wants to do. I was limited on the money I had at the time of my problem and did what I had to do to fix my problem. I did a ton of reading other people problems and fixes then decided what I was going to do. I talked to mechanic buddies and talked to anyone who would listen .The op can take what I have written and use it or he can go to the shop or he can do whatever he wants!!!! Thank you for your input, or lack there of. And if he does all that and it doesn't work it will only cost less than $50.

phwe9774 Enthusiast

phwe9774

Posted
  • Author
Posted

Well this got unnecessarily aggressive. Let's just calm down everyone. Knotsure's post did help because I hadn't thought of that sensor yet. And, before this post, I didn't know there was a way to have the xfer case scanned. I'm obviously going to look into that first. Everybody's input is helpful, unless you're attacking someone for saying he had the same problem and laying out what he did to fix it. I don't tolerate that at all from anyone

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

Your post does not help the OP. I am however giving my experience and he can decide for himself what he wants to do. I was limited on the money I had at the time of my problem and did what I had to do to fix my problem. I did a ton of reading other people problems and fixes then decided what I was going to do. I talked to mechanic buddies and talked to anyone who would listen .The op can take what I have written and use it or he can go to the shop or he can do whatever he wants!!!! Thank you for your input, or lack there of. And if he does all that and it doesn't work it will only cost less than $50.

Well this got unnecessarily aggressive. Let's just calm down everyone. Knotsure's post did help because I hadn't thought of that sensor yet. And, before this post, I didn't know there was a way to have the xfer case scanned. I'm obviously going to look into that first. Everybody's input is helpful, unless you're attacking someone for saying he had the same problem and laying out what he did to fix it. I don't tolerate that at all from anyone

Guys , no one knows what people are looking for and what they will do with advise givin, if a member does something here that some one else had done AND DOESNT FIX IT , how would you feel ? Think about that for a second , wasting hard earned money ,,,,

 

We can't do that EVER !!!

 

Is my point

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